To become sweaty after walking up a hill and then going into a heated building. Also applicable after walking up stairs, ramps, or down a long hallway.
Damn, after the walk up that hill, I'm breaking out with a bitchin' case of the Kaycee sweats.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.